Long term changes in the communities of native ladybirds in Northern Italy: impact of the invasive species Harmonia axyridis (Pallas)

Masetti, Antonio; Magagnoli, Serena; Lami, Francesco; Lanzoni, Alberto; Burgio, Giovanni

doi:10.1007/s10526-018-9891-7

Cited by 26 publications

(23 citation statements)

References 30 publications

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“…Since then, it started to represent between 60 and 80% of all adult ladybirds. Similar levels of dominance on broadleaved trees were also found recently in other European countries such as England [ 15 ], Czech Republic [ 19 ] and Italy [ 20 ].…”

Section: Discussionsupporting

confidence: 84%

“…Although it is known that ladybird populations can vary greatly from year to year [ 13 ] (see also Table 1 , Table 2 , Table 3 and Table 4 for variations observed in some ladybirds, e.g., C. septempunctata and T. sedecimpunctata ), the fact that A. bipunctata has almost disappeared from our records since 2010 strongly suggests that this decline in populations is not due to natural fluctuations in populations but more probably to the presence of H. axyridis . Adalia bipunctata used to be the most abundant species in this habitat in Switzerland [ 4 ] and other European countries, e.g., [ 19 , 20 , 21 , 22 ]. Another 11-year study in England also showed that A. bipunctata was the only species to decline significantly after the arrival of H. axyridis [ 15 ].…”

Section: Discussionmentioning

confidence: 99%

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Long Term Monitoring in Switzerland Reveals That Adalia bipunctata Strongly Declines in Response to Harmonia axyridis Invasion

Kenis

Nacambo

Vlaenderen

et al. 2020

Insects

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A long-term monitoring was conducted at 40 sites in four different habitats in north-western Switzerland to observe changes in populations of native ladybirds, following the invasion of the Asian harlequin ladybird, Harmonia axyridis. From 2006 to 2017, the same trees and meadows were sampled at least seven times per year using standard protocols. On 15 broadleaved hedges, H. axyridis quickly became the dominant species, representing 60 to 80% of adult ladybirds collected. It was second in abundance at five pine (Pinus sylvestris) stands and was a minor component of the ladybird complex at five spruce (Picea abies) stands and in 15 meadows. This survey revealed the severe decline of Adalia bipunctata, which was the most abundant native ladybird on broadleaved trees in 2006–2009 and has almost disappeared since 2010. So far, other native ladybirds do not seem to decline significantly, including species occupying the same ecological niches as H. axyridis. The total number of aphidophagous ladybirds did not decline either, suggesting that the biological control function of ladybirds on aphids living in these habitats has not been affected by the arrival of H. axyridis. Recommendations are given to further assess the impact of H. axyridis on native ladybirds and aphids.

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Section: Discussionsupporting

confidence: 84%

Section: Discussionmentioning

confidence: 99%

Long Term Monitoring in Switzerland Reveals That Adalia bipunctata Strongly Declines in Response to Harmonia axyridis Invasion

Kenis

Nacambo

Vlaenderen

et al. 2020

Insects

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“…Predatory arthropods have been successfully sampled from apple trees by removing branches over a cloth, and then cutting into smaller sections and putting these into a revolving rectangular shaker and dislodging the insects [154]. Beating has been used to sample coccinellids on trees and shrubs in a study of the impacts of the invasive coccinellid Harmonia axyridis (Pallas) on native coccinellids [155]. Shaking or beating may substitute for sweep netting when shrubs and small trees are being sampled, or in dense, thorny habitats that are not suitable for sweeping.…”

Section: Natural Enemies/pest Managementmentioning

confidence: 99%

A Review of Sampling and Monitoring Methods for Beneficial Arthropods in Agroecosystems

McCravy

2018

Insects

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Beneficial arthropods provide many important ecosystem services. In agroecosystems, pollination and control of crop pests provide benefits worth billions of dollars annually. Effective sampling and monitoring of these beneficial arthropods is essential for ensuring their short- and long-term viability and effectiveness. There are numerous methods available for sampling beneficial arthropods in a variety of habitats, and these methods can vary in efficiency and effectiveness. In this paper I review active and passive sampling methods for non-Apis bees and arthropod natural enemies of agricultural pests, including methods for sampling flying insects, arthropods on vegetation and in soil and litter environments, and estimation of predation and parasitism rates. Sample sizes, lethal sampling, and the potential usefulness of bycatch are also discussed.

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“…Again, of course, it is just this sort of depression of pest aphids in agricultural fields that is the goal of biological control. Both the relative segregation of H. axyridis into trees rather than herbaceous crops (Honek et al 2019;Masetti et al 2018), and the gradual accumulation of parasitoids attacking H. axyridis in the introduced range (e.g., Ceryngier et al 2018) may further diminish any risk that these beetles pose to natives. More generally, both C. septempunctata and H. axyridis may fall into the ''just right'' place on our risk curve (Fig.…”

Section: Just Right? Intermediate Generalistsmentioning

confidence: 99%

Are specialists really safer than generalists for classical biocontrol?

Taylor

Snyder

2020

BioControl

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Generalists rarely are considered for classical biocontrol because their broad feeding habits are expected to make non-target impacts inevitable. This assumes an increase in overall ecological risk with increasing number of feeding connections. With the goal of inspiring fresh consideration of the safety of exotic biocontrol agents for classical biocontrol, we present a selective review of the impacts of nine particularly-well-studied exotic natural enemies ranging from relative specialists to generalists. Surprisingly, non-target effects could be particularly strong for relative specialists that attacked just a few natives, but were often widespread but weak for the broadest generalists. This appeared to reflect relatively strong apparent competition and density-dependence for the narrow feeders, versus broadly diffuse net effects for the broader feeders. Overall, we suggest a sole focus on specialists in classical biocontrol might be an unreliable means to reduce ecological risk. Additional research is needed to fully compare the net direct and indirect effects of generalists and specialists across food webs, following classical biocontrol releases.

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Long term changes in the communities of native ladybirds in Northern Italy: impact of the invasive species Harmonia axyridis (Pallas)

Cited by 26 publications

References 30 publications

Long Term Monitoring in Switzerland Reveals That Adalia bipunctata Strongly Declines in Response to Harmonia axyridis Invasion

Long Term Monitoring in Switzerland Reveals That Adalia bipunctata Strongly Declines in Response to Harmonia axyridis Invasion

A Review of Sampling and Monitoring Methods for Beneficial Arthropods in Agroecosystems

Are specialists really safer than generalists for classical biocontrol?

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